ivi-shell: fix init error path

This was forgetting to remove the compositor destroy listener if init failed,
which would lead to use-after-free on compositor tear-down. Found by
inspection.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

ivi-shell/ivi-shell.c

@@ -649,6 +649,7 @@ err_desktop:
 	weston_desktop_destroy(shell->desktop);
 
 err_shell:
+	wl_list_remove(&shell->destroy_listener.link);
 	free(shell);
 
 	return IVI_FAILED;